Exhaust specialist BTB Exhausts, which specialises in race and trackday systems and silencers, has produced a silencer for the Caterham R400. This adds to the R300 and R500 silencers BTB already produces.
"This silencer is specifically designed for drivers wishing to use their cars at circuits that have drive-by noise monitoring," said MD Joe Ellis.
According to BTB, the new lightweight silencer box features unique internal baffling and is priced at £380 plus VAT in mild steel or £450 plus VAT in stainless steel including fitting and noise test.
Ellis said: "The noise problem has intensified after several landmark rulings in favour of local councils forced the circuit owners to adopt continuous trackside noise monitoring in order to comply with planning requirements. The problem is compounded by many car users' belief that more noise means more power - that's not the case at trackday level, or even for some race cars.
"We've already a great deal of experience in terms of supplying power-efficient silencers to leading F3 and BTCC teams, and this has enabled them to test at circuits normally made unavailable to them because of strict noise regulations.
"There's a bonus for trackday enthusiasts as a result: by applying the same exhaust technology it is possible for them to enjoy their highly modified cars' full potential whilst still satisfying circuit noise requirements, a matter which is coming more and more to the fore.
"Furthermore, BTB can offer a free noise-testing service to all members of recognised trackday clubs so that they can establish their cars' noise levels before wasting their time and money taking a non-compliant car to a noise restricted circuit. If there is a potential problem, then BTB can accurately advise and quote for a suitable system that solves that problem."
![](data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 3"%3E%3C/svg%3E)
![](data:image/svg+xml,%3Csvg xmlns="https://www.w3.org/2000/svg" viewBox="0 0 1 1"%3E%3C/svg%3E)